IIT JEE Practice Question and Answer

Q: Train K crosses a stationary Train L in 50 seconds and a pole in 20 seconds with the same speed. The length of the Train K is 240 meters. What is the length of stationary Train L ? 1076 0

  • 1
    60 mts
    Correct
    Wrong
  • 2
    120 mts
    Correct
    Wrong
  • 3
    240 mts
    Correct
    Wrong
  • 4
    360 mts
    Correct
    Wrong
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Answer : 4. "360 mts"
Explanation :

Answer: D) 360 mts Explanation: Speed of the Train K is given by s = d/t = 240/20 = 12 m/sDistance covered by Train K in 50 seconds = 12 x 50 = 600 mts.But it crosses Train L in 50 seconds Therefore, the length of the Train L is = 600 - 240 = 360 mts.

Q: Only For Geniuses Solve this MathPuzzle if you can? 1076 0

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Answer :
Explanation :

Let the required number be 'X' Condition 1 :   XX = 2X  => 2X2 = X => X = 12   Condition 2 : X × X = X2=> X = 12   Therefore, 12 is the number which becomes double when it is divided by itself and becomes half when it is multiplied by itself.

Q: I go in hard. I come out soft. You blow me hard. What am I? 1075 0

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Answer :
Explanation :

Gum.

Q: Which of the following is an example of chemical weathering? 1075 0

  • 1
    Oxidation
    Correct
    Wrong
  • 2
    Acid rains
    Correct
    Wrong
  • 3
    Carbonation
    Correct
    Wrong
  • 4
    All the above
    Correct
    Wrong
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Answer : 4. "All the above"
Explanation :

Answer: D) All the above Explanation: Chemical weathering is what happens when rocks are broken down and chemically altered. Chemical weathering is the breakdown of rocks by chemical reactions. Chemical weathering involves changes in the chemical composition of the existing rock to form new rock. Some examples of chemical weathering are hydrolysis, oxidation, carbonation, dissolution, etc.

Q: Air pressure is measured in which of the following units? 1075 0

  • 1
    Steridian
    Correct
    Wrong
  • 2
    kg/mts
    Correct
    Wrong
  • 3
    Newton
    Correct
    Wrong
  • 4
    Pascal
    Correct
    Wrong
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Answer : 4. "Pascal"
Explanation :

Answer: D) Pascal Explanation: Pressure = (Net Force) / (Applied area) = Newton / square meters Measuring units of pressure are: . Pascal. Bar. Torr. Pounds per square inch (psi). Standard atmosphere (atm).

Q: Consent of the People means 1074 0

  • 1
    All the People
    Correct
    Wrong
  • 2
    Majority of People
    Correct
    Wrong
  • 3
    Leader of the People
    Correct
    Wrong
  • 4
    A few People
    Correct
    Wrong
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Answer : 2. "Majority of People"
Explanation :

Answer: B) Majority of People Explanation: Consent of the People means the Majority of People, as expressed by votes in elections. Consent of the governed refers to the idea that a government's legitimacy and moral right to use state power is only justified and lawful when consented to by the people or society over which that political power is exercised.

Q: Order of basicity of amines in gaseous state? 1073 0

  • 1
    2'> 1'> 3' > NH3
    Correct
    Wrong
  • 2
    3' > 2' > 1'> NH3
    Correct
    Wrong
  • 3
    1' > 2' > 3'> NH3
    Correct
    Wrong
  • 4
    2'> 3'> 1' > NH3
    Correct
    Wrong
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Answer : 2. "3' > 2' > 1'> NH3"
Explanation :

Answer: B) 3' > 2' > 1'> NH3 Explanation: The order of basicity in ammonia is different in gaseous phases vs. aqueous phases due to hydrogen bonding.   So in gaseous phases it's the well known: 3' > 2' > 1'> NH3. Just so we're on the same page, this is due to the inductive effect of electron donating alkyl groups--they destabilize the lone pair on nitrogen atom, making nitrogen more basic.   But in aqueous phase, the order is slightly different: 2'> 1'> 3' > NH3.

Q: Atoms Are Composed Of 1073 0

  • 1
    Electrons and Protons
    Correct
    Wrong
  • 2
    Protons and Nuclei
    Correct
    Wrong
  • 3
    Only Electrons
    Correct
    Wrong
  • 4
    Electrons and Nuclei
    Correct
    Wrong
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Answer : 4. "Electrons and Nuclei"
Explanation :

Answer: D) Electrons and Nuclei Explanation: Atoms are composed of Electrons, protons and Neutrons. Protons and Neutrons together called as Nuclei.

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